Tuition and travel costs are often very high, especially for students from developing nations, and student visas can be difficult to obtain and maintain.

BBC: The statistics of studying abroad

In practice, they will be able to act only inside Japan, and proof of wrongdoing will, as now, be difficult to obtain.

ECONOMIST: Japan

It can be difficult to obtain information about how prisons operate.

FORBES: UPDATED: Private Prisons Are Exempted From Federal Disclosure Laws; Advocates Say That Should Change

The lesson here is one for creditors: It is not particularly easy to bring a fraudulent transfer action, especially where foreign transactions and entities are involved such that proof of the fraudulent transfer may be difficult to obtain.

FORBES: Kremen -- Failure To Prove Fraudulent Transfer

The more time you can get the better, but of course longer interviews will be more difficult to obtain.

FORBES: Are You Making Something Usable? Part 6 -- How to do it.

Credit cards are especially important, and may be somewhat difficult to obtain.

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My opposition is grounded, in part, in my belief that a criminal conviction would be extremely difficult to obtain in a court of law.

CNN: House Judiciary Committee hearing,

It can be difficult to locate copyright holders to obtain the rights to reuse old material.

ECONOMIST: Why the rules on copyright need to return to their roots

Since then, Anonymous has moved away from DDoS-ing websites, which can require either mass support from thousands of individuals or the use of a botnet (a network of infected computer which can be expensive or difficult to obtain).

FORBES: Anonymous Supporters Vow Revenge For Troy Davis